JP2022535573A - Device for compensating for pressure fluctuations - Google Patents

Abstract

The present invention relates to a device for compensating air pressure fluctuations for a vacuum cleaner, the device comprising a body through which a first air flow can flow in a first flow direction. The body includes at least one through opening and a separation element for separating the through opening from ambient air, the separation element creating a reservoir between the body and the separation element for holding an air volume. and is movable to at least partially maintain a vacuum created within the body by the airflow. The invention also relates to a vacuum cleaner hose including a device for a vacuum cleaner to compensate for air pressure fluctuations.

Description

The present invention relates to a device for a vacuum cleaner for compensating air pressure fluctuations, having a body through which an air flow can flow in the direction of flow.

Furthermore, the invention relates to a vacuum cleaner hose with at least one device for compensating air pressure fluctuations for the vacuum cleaner.

Prior art vacuum cleaners used in conjunction with dust generating power tools, particularly hammer drills, grinders or saws, typically have a filter cleaning system for occasional cleaning of the filter within the vacuum cleaner. Occasional cleaning keeps the filter functioning. In this case, filter cleaning is accomplished by a brief and sudden reversal of pressure conditions upstream and downstream of the filter that reverses normal air flow through the filter to be cleaned. The air flow, in the form of a pressure surge, flowing against the normal direction of flow has the effect that the accumulated dust and dirt falls from the filter into the collecting container, so that the filter is freed again and filtered. result in improved action. However, this causes pressure fluctuations within the aspiration system.

Occasional cleaning of the filter due to occasional abrupt reversals of pressure conditions upstream and downstream of the filter can reduce the suction capacity of the vacuum cleaner to the extent that proper suction of dirt is no longer guaranteed.

SUMMARY OF THE INVENTION The object of the present invention is therefore a device for a vacuum cleaner and a vacuum cleaner comprising a device for a vacuum cleaner, which solves the above-mentioned problems and allows at least an adequate suction of dust even during cleaning of the filter. is to provide a vacuum cleaner hose.

This object is achieved by the subject matter of claim 1 and by the subject matter of claim 6. Advantageous embodiments are presented in the dependent claims.

In this case, the object is achieved by a device for a vacuum cleaner for compensating air pressure fluctuations, which has a body through which an air flow can flow in the direction of flow.

According to the invention, the body includes at least one passageway opening and includes a separation element for separating the passageway opening from ambient air, the separation element comprising a reservoir for receiving an amount of air that is formed between the body and the separation element. and is movable to ensure that the vacuum generated within the body by the air flow is at least partially maintained.

According to an advantageous embodiment of the invention it may be possible to configure the separating element in the form of a flexible diaphragm. Thereby it is possible to provide in a simple manner a separation element which, on the one hand, adheres exactly to the shape of the outer wall of the body and, on the other hand, produces a reservoir shape which is as variable as possible.

According to another advantageous embodiment of the invention, it may likewise be possible for the separating element to be configured in the form of a piston-cylinder unit. Thereby it is possible to produce separating elements that are as stable as possible, are very resistant to mechanical influences (for example impacts or collisions) and ensure reliable functioning. .

According to an advantageous embodiment of the invention, it may be possible to configure the separation element in the form of a plate that can be pivoted away from the body. Plates that can be pivoted apart can be referred to as pivotable or rotatable (in the sense of rotatable). Likewise, the most stable separating element possible can be provided by this means. Here, the embodiment of the separating element in the form of a plate that can be pivoted away only needs to be fixed to the body by a single hinge element, thus differing from the embodiment as a piston-cylinder unit. In contrast, it ensures that less fitting accuracy is required. The free pivoting ends of the separation elements, embodied as plates that can be pivoted apart, are configured such that an airtight seal is formed between the free pivoting ends of the separation elements and the outer wall of the body. It can be fixed to the outer wall of the main body by means of a diaphragm. Moreover, the embodiment as a plate that can be pivoted away ensures a certain robustness against dust entering the device.

According to another advantageous embodiment of the invention, it may furthermore be possible to configure the separating element in the form of a bellows.

According to advantageous embodiments of the invention, it may be possible to include more than one body. Thereby, it is possible to variably increase the effectiveness of compensation for air pressure fluctuations.

The object is further achieved by a vacuum cleaner hose having at least one device for compensating air pressure fluctuations for the vacuum cleaner, which has a body through which an air flow can flow in the direction of flow.

Further advantages can be found from the description of the figures below. The figures illustrate various exemplary embodiments of the present invention. The figures, description and claims contain a number of features in combination. Also, those skilled in the art will consider features individually and combine them as appropriate to form additional useful combinations.

In the drawings, the same components and components of the same type are denoted by the same reference numerals.

1 shows a schematic side view of a vacuum cleaner with a device according to the invention for compensating air pressure fluctuations, with a vacuum cleaner hose according to the invention and with a separating element in a first position, according to a first embodiment; FIG. . 1 shows a schematic side view of a vacuum cleaner with a vacuum cleaner hose according to the invention and a device according to the invention for compensating air pressure fluctuations, with a separating element in a second position, according to a first embodiment; FIG. Fig. 3 shows a schematic side view of a vacuum cleaner with a vacuum cleaner hose according to the invention with a device according to the invention for compensating air pressure fluctuations according to a second embodiment; Fig. 3 shows a schematic side view of a vacuum cleaner with a vacuum cleaner hose according to the invention with a device according to the invention for compensating air pressure fluctuations according to a third embodiment; 1 shows a perspective view of a device according to the invention for compensating air pressure fluctuations according to a first embodiment, with the separating element in a first position; FIG. 1 shows a perspective view of the device according to the invention for compensating air pressure fluctuations according to the first embodiment, with the separating element in the second position; FIG. Fig. 3 shows a side view of the device according to the invention for compensating air pressure fluctuations according to a second embodiment, with the separating element in a first position; Fig. 3 shows a side view of the device according to the invention for compensating air pressure fluctuations according to a third embodiment, with the separating element in the second position;

Figures 1a and 1b show a vacuum cleaner 1 with a device 2 for compensating air pressure fluctuations according to a first embodiment.

Here, the vacuum cleaner 1 substantially comprises a suction head 3 , a container 4 and a suction device 5 .

1a-3, the suction head 3 substantially comprises a filter 6, a filter cleaning device 7 and a turbine 8. FIG.

Turbine 8 serves to generate a vacuum by means of which air flow LS flows inside vacuum cleaner 1 . With this air flow LS dust particles and dirt particles can be sucked up and transported into the receiving container 4 for storage.

The filter 6 serves to filter dust and dirt particles from the airflow LS drawn by the vacuum cleaner 1 and thus protects the turbine 8 particularly from dust and contamination.

The filter cleaning device 7 is designed to briefly and abruptly reverse the pressure conditions in the flow direction HS upstream and downstream of the filter 6 . In other words, airflow LS in direction B is reversed in direction A. The resulting air pressure surge leads to cleaning of the filter 6 so that dust and dirt deposited on the filter 6 fall in the direction B into the container 4 . As a result, the filter 6 becomes free and functional again. The filter cleaning device 7 then regenerates the air flow LS along the flow direction HS. The functioning and in particular the readjustment of the filter cleaning device 7 are controlled by the control device 9 .

The receiving container 4 is constructed substantially as a container with a holding volume. Wheels 10 are provided on the underside of the container 4 configured as a container in order to ensure mobility of the vacuum cleaner. Only two wheels 10 are shown in the figure.

The intake device 5 substantially comprises a vacuum cleaner hose 11, a fastening element 12 and a nozzle. The nozzle can be, for example, a floor nozzle. Nozzles are not shown in the figure.

The fastening element 12 is configured substantially as a cylindrical tube and serves as an interface or connection for the vacuum cleaner hose 11 to the container 4 .

Figures 4 and 5 show a device 2 for compensating air pressure fluctuations according to a first embodiment. In this case, device 2 substantially comprises body 13 and separating element 14 .

The body 13 is substantially configured as a tubular cylinder with a waist region TB. The body 13 thus includes a first region 15 and a second region 16 with a first cross-sectional flow area 17 and a third region 18 with a second cross-sectional flow area 19 . A third region 18 is positioned between the first region 15 and the second region 16 . The transition 20 from the first region 15 to the third region 18 and the transition 21 from the second region 16 to the third region 18 are each frustoconical configurations. Body 13 further includes a number of passage openings 22 along the length L of body 13 . The passage opening 22 can also be called a through hole. Air can flow from the interior of the body 13 to the exterior and enter the interior of the body 13 from the exterior through the passage openings 22 .

According to a first embodiment, the separating element 14 is constructed in the form of a hose constructed from a flexible diaphragm (see FIGS. 4 and 5). Separating element 14 , here configured as a diaphragm, surrounds the region of body 13 with passage opening 22 . Separation element 14 thus extends from first region 15 to second region 16 of body 13 .

According to another advantageous embodiment, a number of radially aligned ridges are arranged on the outer wall AW of the body 13 . Raised portions are not shown in the figure. The raised portion can be configured as a rib. The raised portion ensures that during the normal suction process the separating element 14 configured as a diaphragm abuts only tangentially against the raised portion and the remaining outer wall AW of the body 13 is not covered by the separating element 14. help you to Here it is possible to position the passage opening 22 only at the upper end of the raised portion. As a result, the separating element 14, which is configured as a diaphragm, sticks to the body 13 only in the region of the raised portion during normal suction processes. This adsorption can lead to a greater, uniform and improved preloading of the separating element 14 configured as a diaphragm against the body 13 during the normal suction process. By preloading the separating element 14 as evenly as possible, a better suction function of the vacuum cleaner 1 is ensured.

As illustrated in FIG. 1a, during use of the vacuum cleaner 1 in the vacuum cleaning mode, an airflow LS passes from a floor nozzle (not shown) through the vacuum cleaner hose 11 to compensate for air pressure fluctuations. It flows in flow direction HS through the device 2, the receiving vessel 4, the filter 6 and the turbine 8 and exits the suction head 3 rearwardly through an outflow opening (not shown). Dust and dirt particles are thereby sucked in vacuum cleaning mode. In vacuum cleaner mode, the airflow LS flows from the second end 16 of the body 13 along the body 13 to the first end 15 of the body 13 (see Figure 4). When the airflow LS is flowing through the device along the flow direction HS, the separating element 14, which is constructed as a flexible diaphragm, is attracted to the outer wall AW of the body 13 by the vacuum generated by the airflow LS. As a result, the separation element 14 bears closely against the outer wall AW of the body 13 and in doing so covers the passage opening 22 . The separating element 14 is in the first position (see Figures 1a and 4). During this process, the airflow LS is not significantly impaired and dust continues to be drawn into the vacuum cleaner 1 by the airflow LS.

FIG. 1b shows the vacuum cleaner 1 in filter cleaning mode, which removes accumulated dust and dirt from the filter 6 (as explained above). A brief reversal of the pressure conditions upstream and downstream of the filter 6 causes a pressure surge to clean the filter 6 .

As already explained above, cleaning the filter 6 in this way can compromise the vacuum in the suction device 5 , in particular in the vacuum cleaner hose 11 .

Due to the special configuration of the device 2 for compensating for air pressure fluctuations, a vacuum is maintained in the suction device 5, in particular in the vacuum cleaner hose 11, in order to allow an uninterrupted suction process.

The preload on the separating element 14 configured as a flexible diaphragm is reduced so that the separating element 14 radially separates from the outer wall AW of the body 13 . The separating element 14 thus moves radially from a first position (see FIGS. 1a and 4) to a second position (see FIGS. 1b and 5). Movement of the separating element 14 creates a pressure difference between the still relatively low air pressure inside the body 13 and the atmospheric pressure of the ambient air UL around the body 13 . As a result of the movement of the separation element 14 in the radial direction, a reservoir 23 is created between the body 13 and the separation element 14 for receiving the air volume LV. Thus, the vacuum generated within the body 13 by the air flow LS is at least partially maintained and the suction process continues.

As already mentioned above, FIGS. 1a and 1b show a vacuum cleaning according to the invention in which the device 2 for compensating air pressure fluctuations is positioned between the first hose section 24 and the second hose section 25. 1 shows a first embodiment of a machine hose 11; The two hose sections 24, 25 are of substantially the same length.

Figure 2 shows a second embodiment of a vacuum cleaner hose 11 according to the invention, in which a device for compensating air pressure fluctuations is positioned between the first hose part 24 and the second hose part 25. show.
In this case the first hose section 24 is longer than the second hose section 25 .

FIG. 3 shows a third embodiment of the vacuum cleaner hose 11 according to the invention, in which the device 2 for compensating air pressure fluctuations is positioned directly on the fastening element 12 for the container 4 . Therefore, there is only one hose section.

FIG. 6a shows another embodiment of the device 2 for compensating air pressure fluctuations, in which the separating element 14 is configured substantially as a piston-cylinder unit. The separating element 14, which is configured as a piston-cylinder unit, is connected to the interior of the body 13 by means of a passage opening 22 such that the air volume LV can flow out of the interior of the body 13 and into the cylinder 26 in direction B. . The pressure difference between the air pressure inside the body 13 and the ambient air UL ensures that the piston 27 is pushed in direction B. Below the piston 27, in direction A, a reservoir 23 is formed in the cylinder 26 between the body 13 and the separating element 14 for receiving an air volume LV. An opening 28 is provided at the upper end 26a of the cylinder 26, so that the area above the piston 27 in direction B is filled with ambient air UL and atmospheric pressure.

FIG. 6b shows another embodiment of the device 2 for compensating air pressure fluctuations, in which the separating element 14 is configured substantially as a piston-cylinder unit, like the embodiment of FIG. 6a. 6a, the passage opening 22 between the body 13 and the separation element 14 in the embodiment of FIG.

Furthermore, according to an embodiment not shown in the figures, it is also possible to position the device 2 for compensating air pressure fluctuations in the receiving container 4 .

REFERENCE SIGNS LIST 1 vacuum cleaner 2 device for compensating air pressure fluctuations 3 suction head 4 receiving container 5 suction device 6 filter 7 filter cleaning device 8 turbine 9 control device 10 wheel 11 vacuum cleaner hose 12 fastening element 13 body 14 separating element 15 body first region of body 16 second region of body 17 first cross-sectional flow area 18 third region of body 19 second cross-sectional flow area 20 transition from first region 15 to third region 18 21 transition from second region 16 to third region 18 22 passage opening 23 reservoir 24 first hose section 25 second hose section 26 cylinder 27 piston 28 opening 29 closing element AW outer wall of body L of body Length LS Air flow HS Flow direction LV Air volume UL Ambient air

Claims (6)

A device (2) for a vacuum cleaner (1) for compensating air pressure fluctuations, having a body (13) through which an air flow (LS) can flow in a flow direction (HS), comprising:
said body (13) comprising at least one passageway opening (22) and comprising a separation element (14) for separating said passageway opening (22) from ambient air (UL), said separation element (14), a reservoir (23) for receiving an air volume (LV) is created between said body (13) and said separating element (14) and is forced into said body (13) by said air flow (LS); A device (2), characterized in that it is movable so as to ensure that the generated vacuum is at least partially maintained. Device (2) according to claim 1, characterized in that said separating element (14) is constructed in the form of a flexible diaphragm. A device (2) according to claim 1, characterized in that said separating element (14) is constructed in the form of a piston-cylinder unit. Device (2) according to claim 1, characterized in that said separation element (14) is configured in the form of a plate that can be pivoted away from said body (13). Device (2) according to at least one of the preceding claims, characterized in that it comprises more than one body (13). A vacuum cleaner hose (11) comprising at least one device (2) according to at least one of claims 1-5.

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